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wireshark/epan/dissectors/packet-enc.c
Michael Mann 1e60d63c8c Create call_data_dissector() to call data dissector. 
This saves many dissectors the need to find the data dissector and store a handle to it.

There were also some that were finding it, but not using it.
For others this was the only reason for their handoff function, so it could be eliminated.

Change-Id: I5d3f951ee1daa3d30c060d21bd12bbc881a8027b
Reviewed-on: https://code.wireshark.org/review/14530
Petri-Dish: Michael Mann <mmann78@netscape.net>
Reviewed-by: Michael Mann <mmann78@netscape.net>
2016-03-20 17:38:03 +00:00

189 lines
6.2 KiB
C
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/* packet-enc.c
*
* Copyright (c) 2003 Markus Friedl. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "config.h"
#include <epan/packet.h>
#include <epan/capture_dissectors.h>
#include <epan/aftypes.h>
#include <wsutil/pint.h>
void proto_register_enc(void);
void proto_reg_handoff_enc(void);
/* The header in OpenBSD Encapsulating Interface files. */
struct enchdr {
guint32 af;
guint32 spi;
guint32 flags;
};
#define BSD_ENC_HDRLEN 12
#define BSD_ENC_M_CONF 0x0400 /* payload encrypted */
#define BSD_ENC_M_AUTH 0x0800 /* payload authenticated */
#define BSD_ENC_M_COMP 0x1000 /* payload compressed */
#define BSD_ENC_M_AUTH_AH 0x2000 /* header authenticated */
static dissector_table_t enc_dissector_table;
/* header fields */
static int proto_enc = -1;
static int hf_enc_af = -1;
static int hf_enc_spi = -1;
static int hf_enc_flags = -1;
static int hf_enc_flags_payload_enc = -1;
static int hf_enc_flags_payload_auth = -1;
static int hf_enc_flags_payload_compress = -1;
static int hf_enc_flags_header_auth = -1;
static gint ett_enc = -1;
static gint ett_enc_flag = -1;
static gboolean
capture_enc(const guchar *pd, int offset _U_, int len, capture_packet_info_t *cpinfo, const union wtap_pseudo_header *pseudo_header _U_)
{
guint32 af;
if (!BYTES_ARE_IN_FRAME(0, len, BSD_ENC_HDRLEN))
return FALSE;
af = pntoh32(pd);
return try_capture_dissector("enc", af, pd, BSD_ENC_HDRLEN, len, cpinfo, pseudo_header);
}
static const value_string af_vals[] = {
{ BSD_AF_INET, "IPv4" },
{ BSD_AF_INET6_BSD, "IPv6" },
{ 0, NULL }
};
static int
dissect_enc(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void* data _U_)
{
struct enchdr ench;
tvbuff_t *next_tvb;
proto_tree *enc_tree;
proto_item *ti;
static const int *flags[] = {
&hf_enc_flags_payload_enc,
&hf_enc_flags_payload_auth,
&hf_enc_flags_payload_compress,
&hf_enc_flags_header_auth,
NULL
};
col_set_str(pinfo->cinfo, COL_PROTOCOL, "ENC");
ench.af = tvb_get_ntohl(tvb, 0);
ench.spi = tvb_get_ntohl(tvb, 4);
if (tree) {
ti = proto_tree_add_protocol_format(tree, proto_enc, tvb, 0,
BSD_ENC_HDRLEN,
"Enc %s, SPI 0x%8.8x",
val_to_str(ench.af, af_vals, "unknown (%u)"),
ench.spi);
enc_tree = proto_item_add_subtree(ti, ett_enc);
proto_tree_add_item(enc_tree, hf_enc_af, tvb, 0, 4, ENC_BIG_ENDIAN);
proto_tree_add_item(enc_tree, hf_enc_spi, tvb, 4, 4, ENC_BIG_ENDIAN);
proto_tree_add_bitmask(enc_tree, tvb, 8, hf_enc_flags, ett_enc_flag, flags, ENC_BIG_ENDIAN);
}
/* Set the tvbuff for the payload after the header */
next_tvb = tvb_new_subset_remaining(tvb, BSD_ENC_HDRLEN);
if (!dissector_try_uint(enc_dissector_table, ench.af, next_tvb, pinfo, tree))
call_data_dissector(next_tvb, pinfo, tree);
return tvb_captured_length(tvb);
}
void
proto_register_enc(void)
{
static hf_register_info hf[] = {
{ &hf_enc_af,
{ "Address Family", "enc.af", FT_UINT32, BASE_DEC, VALS(af_vals), 0x0,
"Protocol (IPv4 vs IPv6)", HFILL }},
{ &hf_enc_spi,
{ "SPI", "enc.spi", FT_UINT32, BASE_HEX, NULL, 0x0,
"Security Parameter Index", HFILL }},
{ &hf_enc_flags,
{ "Flags", "enc.flags", FT_UINT32, BASE_HEX, NULL, 0x0,
"ENC flags", HFILL }},
{ &hf_enc_flags_payload_enc,
{ "Payload encrypted", "enc.flags.payload_enc", FT_BOOLEAN, 32, NULL, BSD_ENC_M_CONF,
NULL, HFILL }},
{ &hf_enc_flags_payload_auth,
{ "Payload encrypted", "enc.flags.payload_auth", FT_BOOLEAN, 32, NULL, BSD_ENC_M_AUTH,
NULL, HFILL }},
{ &hf_enc_flags_payload_compress,
{ "Payload encrypted", "enc.flags.payload_compress", FT_BOOLEAN, 32, NULL, BSD_ENC_M_COMP,
NULL, HFILL }},
{ &hf_enc_flags_header_auth,
{ "Payload encrypted", "enc.flags.header_auth", FT_BOOLEAN, 32, NULL, BSD_ENC_M_AUTH_AH,
NULL, HFILL }},
};
static gint *ett[] =
{
&ett_enc,
&ett_enc_flag
};
proto_enc = proto_register_protocol("OpenBSD Encapsulating device",
"ENC", "enc");
proto_register_field_array(proto_enc, hf, array_length(hf));
proto_register_subtree_array(ett, array_length(ett));
enc_dissector_table = register_dissector_table("enc", "OpenBSD Encapsulating device", proto_enc, FT_UINT32, BASE_DEC, DISSECTOR_TABLE_NOT_ALLOW_DUPLICATE);
register_capture_dissector_table("enc", "ENC");
}
void
proto_reg_handoff_enc(void)
{
dissector_handle_t enc_handle;
enc_handle = create_dissector_handle(dissect_enc, proto_enc);
dissector_add_uint("wtap_encap", WTAP_ENCAP_ENC, enc_handle);
register_capture_dissector("wtap_encap", WTAP_ENCAP_ENC, capture_enc, proto_enc);
}
/*
* Editor modelines - http://www.wireshark.org/tools/modelines.html
*
* Local Variables:
* c-basic-offset: 2
* tab-width: 8
* indent-tabs-mode: nil
* End:
*
* ex: set shiftwidth=2 tabstop=8 expandtab:
* :indentSize=2:tabSize=8:noTabs=true:
*/
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